Due to the failed scheming of Loki, the Hulk, Iron Man, Thor, Ant-Man, and Wasp form the original Avengers, Earth's mightiest heroes. Soon joined by the living legend of World War II, Captain America, they changed their roster completely in issue 16 to include reformed criminals Hawkeye, Quicksilver, and the Scarlet Witch. Since then, they have become an ever changing roster as old members returned and they were joined by the likes of Black Widow, Black Panther, Vision, and Mantis. Even in these early issues, Henry Pym changed his identity three times (from Ant-Man to Giant Man to Goliath to Yellowjacket). The high point of this run is the Kree-Skrull War, which was Marvel's first event and continues to be an inspiration for modern stories.The last major storyline of this era is the Celestial Madonna which reveals a prophesy of a galactic messiah's birth.